p-orbital multiferroics in single-layer SiN

Author:

Feng Yangyang1,Zhang Ting1,Dai Ying1ORCID,Huang Baibiao1,Ma Yandong1ORCID

Affiliation:

1. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Shandanan Street 27, Jinan 250100, China

Abstract

Multiferroics, coupling magnetism with electric polarization, provides special opportunities for both fundamental research and device applications. The current multiferroic research in a two-dimensional lattice is invariably focused on d-orbital based systems. We alternatively show by first-principles calculations that ideal multiferroics is present in a p-orbital based lattice of single-layer SiN. Single-layer SiN is a semiconductor exhibiting intrinsic ferromagnetism and ferroelectricity simultaneously. Its magnetism correlates with the extended p– p interaction between unpaired p orbitals of N atoms. The buckled symmetry guarantees the existence of an out-of-plane electric dipole, giving rise to the ferroelectric order. More remarkably, the ferroic orders in single-layer SiN display strongly coupled physics, i.e., the spatial distribution of magnetic moments can be well controlled by the reversal of electric polarization, thereby establishing the long-sought multiferroics with strong magnetoelectric coupling. These findings not only enrich a two-dimensional multiferroic family, but also enable a wide range of device applications.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Shandong Province

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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